scholarly journals On the Influencing Mechanism of Geothermal Fluids on the Dynamic Changes of Groundwater Flow and Heat Transfer Temperature

2021 ◽  
Vol 39 (3) ◽  
pp. 992-1000
Author(s):  
Qiuyu Bo ◽  
Wuqun Cheng ◽  
Tong Sun
Keyword(s):  
Heat Transfer ◽  
Groundwater Flow ◽  
Coupling Model ◽  
Extraction Process ◽  
Dynamic Changes ◽  
Geothermal Resources ◽  
Influencing Mechanism ◽  
Flow And Heat Transfer ◽  
Geothermal Fluids ◽  
Equation Of Heat Conduction

Nowadays, people are paying increasing attention to the rational exploitation of geothermal resources. To develop and utilize geothermal resources in a scientific way, it is important to understand the change patterns of key geohydrological parameters such as seepage velocity and temperature. As part of the effort, this paper analyzes and studies the influencing mechanism of geothermal fluids on the dynamic changes of groundwater flow and heat transfer temperature. First, a differential equation of heat conduction of geothermal fluids and a groundwater flow-geothermal fluids thermal coupling model were constructed to study the seepage state and the heat transfer of groundwater flow in the energy extraction process. Then, an analytical model for the influence of groundwater seepage on heat transfixion was established, directly showing the relevant mechanism. The experimental results proved the effectiveness of the constructed model.

FSP-DDF coupling model of LBM for the fluid flow and heat transfer in porous media

2019 ◽  
Vol 157 ◽  
pp. 113698
Author(s):  
Baoli Shao ◽  
Shuyan Wang ◽  
Ruichao Tian ◽  
Zhenxuan Qiao ◽  
Yujia Chen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Fluid Flow ◽  
Coupling Model ◽  
Flow And Heat Transfer

Three-Dimensional Coupling Analysis of Flow and Thermal Performance of a Mechanical Seal

2013 ◽  
Vol 6 (1) ◽  
Author(s):  
Dazhuan Wu ◽  
Xinkuo Jiang ◽  
Shuai Yang ◽  
Leqin Wang
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Coupling Model ◽  
Frictional Heat ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
High Rotational Speed ◽  
Flow And Heat Transfer ◽  
Sealing Pressure ◽  
Thermal Conductivities

To accurately obtain the flow and temperature field in mechanical seals and investigate the key influencing factors, a numerical analysis of flow and heat transfer in a contact mechanical seal with high-sealing pressure, high-operating temperature, and high-rotational speed is presented. A three-dimensional (3D) computational model consisting of seal rings, surrounding flushing fluid, and other seal components is constructed. fluent, a commercial computational fluid dynamics (CFD) software, is used to solve the 3D fluid–solid coupling model. Frictional heat, stirred heat, and convection coefficients are focused on in this study to ensure the reliability of the numerical results. The flow field and temperature distributions of the mechanical seal are presented, and the influence of different flushing fluid temperatures, flushing flow rates, and thermal conductivities of the seal rings on heat transfer is discussed. The results show that the stirred heat (accounting for about 10% of the frictional heat in the present mechanical seal) cannot be ignored for high-parameter mechanical seals. The flushing parameters can only influence temperature magnitudes on the seal rings but have minimal effects on the temperature gradients, which, however, can be well improved by adjusting the thermal conductivities of the seal rings.

scholarly journals Microscale flow and heat transfer between the rotor and the flank for rotary engine

2019 ◽  
pp. 330-330
Author(s):  
Zhaoju Qin
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Flow Field ◽  
Velocity Slip ◽  
Coupling Model ◽  
Rotary Engine ◽  
Flow And Heat Transfer ◽  
Microscale Flow ◽  
Commercial Code ◽  
Steady Laminar

This paper is to investigate microscale flow and transfer between the rotor and the flank for rotary engine. The rotor and flank is simplified to two disks in order to study flow field and temperature field conveniently. The paper takes analysis of steady laminar flow and heat transfer between two disks separated by a gas-filled gap due to machining tolerance. A 3-D multi-physical coupling model is used, involving velocity slip, temperature jump, rarefaction and dissipation. A solution based on commercial code COMSOL is derived and the results are used to illustrate the effects to velocity field, temperature distribution, disks' torque and Nusselt number based on the governing parameters. The paper also investigates the effects of different modified Knudsen number on flow field and temperature field.

scholarly journals Numerical study on the influencing mechanism of twisted ratio in outward convex corrugated tubes with a twisted tape insert

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 577-584
Author(s):  
Huaizhi Han ◽  
Longbin Yang ◽  
Yiran Hu ◽  
Ruitian Yu ◽  
Qun Zhang
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Numerical Study ◽  
Twisted Tape ◽  
High Twist ◽  
Numerical Investigations ◽  
Corrugated Tube ◽  
Influencing Mechanism ◽  
Flow And Heat Transfer ◽  
Twist Ratio

Numerical investigations were conducted on flow and heat transfer in an outward convex corrugated tube with various structural twisted tape inserts. The study investigated the influence of twisted ratio on thermodynamic regulation and mechanism in the corrugated tube. The results indicate that Nusselt number in the corrugated tube (Nuc) exceeds those in the corrugated tube and smooth tube by 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The best overall thermal performance (h = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nuc/Nus = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).

scholarly journals New Insights into Hydrothermal Fluid Circulation Affected by Regional Groundwater Flow in the Asal Rift, Republic of Djibouti

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1166
Author(s):  
Abdek Hassan Aden ◽  
Jasmin Raymond ◽  
Bernard Giroux ◽  
Bernard Sanjuan
Keyword(s):  
Heat Transfer ◽  
Groundwater Flow ◽  
Hydrothermal Fluid ◽  
Tectonic Activity ◽  
Normal Faults ◽  
Fluid Circulation ◽  
Magnetotelluric Data ◽  
Flow And Heat Transfer ◽  
Simulated Temperature ◽  
Regional Groundwater

The Asal Rift hosts a lake located in a depression at 150 m below sea level, where recharge is influenced by regional groundwater flow interacting with the Ghoubbet Sea along the coast of Djibouti. This regional groundwater flow is believed to influence hydrothermal fluid circulation, which we aim to better understand in this study, having the objective of developing concepts for geothermal exploration in the area. To this end, magnetotelluric data acquired in the Asal Rift were processed and analyzed. 1D inversion models of electrical conductivity were interpolated for interpretation. These data were then used to build a 2D hydrogeological model, allowing multiphase flow and heat transfer simulations to be performed, considering the regional groundwater flow near the surface and the site topography, in order to confirm the preferred path of fluid flow. Geophysical data analysis indicates the presence of normal faults, notably the H fault, which may act as a conduit for the circulation of hydrothermal fluids and where the hanging wall can be a hydrogeological barrier within the hydrothermal system of the Asal Rift. The results from the 2D numerical flow and heat transfer modelling show the importance of groundwater flow responsible for thermal springs located at the periphery of Asal Lake. Reservoir temperature inferred by means of geothermometry ranging from 200 to 270 °C was shown to correspond to simulated temperature at potential reservoir depth. Moreover, simulated temperature between 600 and 1700 m depth is close to the temperature profile measured in the geothermal well Asal 6 of the area, with less than 20 °C difference. Simulations indicate that hydrothermal fluid circulation is likely influenced by the regional groundwater flow controlled by the topography and the major water bodies, the Ghoubbet Sea and Asal Lake, feeding buoyant fluids interacting with a deep magmatic source and where tectonic activity created normal faults offering a preferred path for fluid circulation.

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